<template>
    <div id="tags-view-container" class="tags-view-container">
        <scroll-pane ref="scrollPane" class="tags-view-wrapper">
            <router-link
                    v-for="tag in visitedViews"
                    ref="tag"
                    :key="tag.path"
                    :class="isActive(tag)?'active':''"
                    :to="{ path: tag.path, query: tag.query, fullPath: tag.fullPath }"
                    tag="span"
                    class="tags-view-item"
                    @click.middle.native="closeSelectedTag(tag)"
                    @contextmenu.prevent.native="openMenu(tag,$event)"
            >
                {{ tag.title }}
                <span v-if="!tag.meta.affix" class="el-icon-close" @click.prevent.stop="closeSelectedTag(tag)"/>
            </router-link>
        </scroll-pane>
        <ul v-show="visible" :style="{left:left+'px',top:top+'px'}" class="contextmenu">
            <li @click="refreshSelectedTag(selectedTag)">刷新页面</li>
            <li v-if="!(selectedTag.meta&&selectedTag.meta.affix)" @click="closeSelectedTag(selectedTag)">关闭当前</li>
            <li @click="closeOthersTags">关闭其他</li>
            <li @click="closeAllTags(selectedTag)">关闭所有</li>
        </ul>
    </div>
</template>
<script lang="ts">
  import ScrollPane from './ScrollPane.vue';
  import {Component, Provide, Ref, Vue, Watch} from 'vue-property-decorator';
  import path from 'path';
  import {Getter} from 'vuex-class';

  @Component({components: {ScrollPane}})
  export default class TagsView extends Vue {
    @Provide() private visible = false;
    @Provide() private top = 0;
    @Provide() private left = 0;
    @Provide() private selectedTag: any = {};
    @Provide() private affixTags: Array<any> = [];
    @Getter('visitedViews') private visitedViews!: any;
    @Getter('routers') private routers!: any;
    @Ref("scrollPane") private scrollPane: any;
    @Ref("tag") private tags: any;

    @Watch('$route')
    onRouteChanged() {
      this.addTags();
      this.moveToCurrentTag();
    }

    @Watch('visible')
    onVisibleChanged(value: any) {
      if (value) {
        document.body.addEventListener('click', this.closeMenu, {passive: false});
      } else {
        document.body.removeEventListener('click', this.closeMenu);
      }
    }

    mounted() {
      this.initTags();
      this.addTags();
    }


    isActive(route: any) {
      return route.path === this.$route.path;
    }

    filterAffixTags(routes: any, basePath = '/') {
      let tags: any = [];
      routes.forEach((route: any) => {
        if (route.meta && route.meta.affix) {
          const tagPath = path.resolve(basePath, route.path);
          tags.push({
            fullPath: tagPath,
            path: tagPath,
            name: route.name,
            meta: {...route.meta}
          });
        }
        if (route.children) {
          const tempTags = this.filterAffixTags(route.children, route.path);
          if (tempTags.length >= 1) {
            tags = [...tags, ...tempTags];
          }
        }
      });
      return tags;
    }

    initTags() {
      const affixTags = this.affixTags = this.filterAffixTags(this.routers);
      for (const tag of affixTags) {
        // Must have tag name
        if (tag.name) {
          this.$store.dispatch('addVisitedView', tag).catch(reason => console.log(reason));
        }
      }
    }

    addTags() {
      const {name} = this.$route;
      if (name) {
        this.$store.dispatch('addView', this.$route).catch(reason => console.log(reason));
      }
    }


    moveToCurrentTag() {
      this.$nextTick(() => {
        for (const tag of this.tags) {
          if (tag.to.path === this.$route.path) {
           this.scrollPane.moveToTarget(tag);
            // when query is different then update
            if (tag.to.fullPath !== this.$route.fullPath) {
              this.$store.dispatch('updateVisitedView', this.$route).catch(reason => console.log(reason));
            }
            break;
          }
        }
      });
    }


    refreshSelectedTag(view: any) {
      this.$store.dispatch('delCachedView', view).then(() => {
        const {fullPath} = view;
        this.$nextTick(() => {
          this.$router.replace({
            path: '/redirect' + fullPath
          }).catch(reason => console.log(reason));
        });
      });
    }


    closeSelectedTag(view: any) {
      this.$store.dispatch('delView', view).then(({visitedViews}) => {
        if (this.isActive(view)) {
          this.toLastView(visitedViews, view);
        }
      }).catch((e) => {
        console.log(e);
      });
    }


    closeOthersTags() {
      this.$router.push(this.selectedTag).catch(reason => console.log(reason));
      this.$store.dispatch('delOthersViews', this.selectedTag).then(() => {
        this.moveToCurrentTag();
      }).catch((e) => {
        console.log(e);
      });
    }


    closeAllTags(view: any) {
      this.$store.dispatch('delAllViews').then(({visitedViews}) => {
        // if (this.affixTags.some(tag => tag.path === view.path)) {
        //     return;
        // }
        this.toLastView(visitedViews, view);
      }).catch((e) => {
        console.log(e);
      });
    }


    toLastView(visitedViews: any, view: any) {
      const latestView = visitedViews.slice(-1)[0];
      if (latestView) {
        this.$router.push(latestView).catch((e) => {
          console.log(e);
        });
      } else {
        // now the default is to redirect to the home page if there is no tags-view,
        // you can adjust it according to your needs.
        if (view.name === 'Dashboard') {
          // to reload home page
          this.$router.replace({path: '/redirect' + view.fullPath}).catch(reason => console.log(reason));
        } else {
          this.$router.push('/').catch(reason => console.log(reason));
        }
      }
    }


    openMenu(tag: any, e: any) {
      const menuMinWidth = 105;
      const offsetLeft = this.$el.getBoundingClientRect().left;// container margin left
      const offsetWidth = (this as any).$el.offsetWidth; // container width
      const maxLeft = offsetWidth - menuMinWidth + offsetLeft; // left boundary
      const left = e.clientX + 15; // 15: margin right

      if (left > maxLeft) {
        this.left = maxLeft;
      } else {
        this.left = left;
      }

      this.top = e.clientY + 10;
      this.visible = true;
      this.selectedTag = tag;
    }

    closeMenu() {
      this.visible = false;
    }
  }
</script>

<style scoped lang="scss">
    .tags-view-container {
        height: 34px;
        width: 100%;
        background: #fff;
        border-bottom: 1px solid #d8dce5;
        box-shadow: 0 1px 3px 0 rgba(0, 0, 0, .12), 0 0 3px 0 rgba(0, 0, 0, .04);

        .tags-view-wrapper {
            .tags-view-item {
                display: inline-block;
                position: relative;
                cursor: pointer;
                height: 26px;
                line-height: 26px;
                border: 1px solid #d8dce5;
                color: #495060;
                background: #fff;
                padding: 0 8px;
                font-size: 12px;
                margin-left: 5px;
                margin-top: 4px;

                &:first-of-type {
                    margin-left: 15px;
                }

                &:last-of-type {
                    margin-right: 15px;
                }

                &.active {
                    background-color: #42b983;
                    color: #fff;
                    border-color: #42b983;

                    &::before {
                        content: '';
                        background: #fff;
                        display: inline-block;
                        width: 8px;
                        height: 8px;
                        border-radius: 50%;
                        position: relative;
                        margin-right: 2px;
                    }
                }
            }
        }

        .contextmenu {
            margin: 0;
            background: #fff;
            z-index: 3000;
            position: absolute;
            list-style-type: none;
            padding: 5px 0;
            border-radius: 4px;
            font-size: 12px;
            font-weight: 400;
            color: #333;
            box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, .3);

            li {
                margin: 0;
                padding: 7px 16px;
                cursor: pointer;

                &:hover {
                    background: #eee;
                }
            }
        }
    }
</style>

